Diaphragm.



u. ZARR.

DIAPHRAGM.

APPLICATION FILED 0(1T.16,1909.

953,889 Patented Apr. 5, 1910.

fl ZZesJeJ: [raven/Z01; fi Clark Zarr, fin a CLARK ZARR. 0F NEWBERRY.PENNSYLVANIA.

DIAPHRAGM.

Specification of Letters Patent.

Application filed October 16, 1909.

Patented Apr. 5, 1910 Serial No. 522.934.

'1'0 (1 whom it may concern:

lle it known that l. (haunt VAun. a citizen of the United Hlales,residing in New berry, in the eounty of lryeoming and State oflenusylvania. have invented certain new and useful lmprorements inDiaphragms, of which the following is a specification.

'lhis invention relates to dianhragms for sound conveying inslrunientsand is particularly applieahle to use in talking machines.

The object of the. invention is to provide a diaphragm which willtransmit the human voice, inst ruinental music and other sounds withoutdetracting from the tonal qualities pr adding any unpleasant sounds. Thedia phragm will he made of suitably prepared and treated lihersheetmaterial. if a center )(lfil is employed this may be made of simiarmalerlal. 'lhe fibrous sheet material diaphragm and post may beassembled and fastened together by a roatin r of some resilientwaterproof material. lh practice the diaphragm may have applied to it agasket ol vielllahle material to prevent the parts which will normallyclamp the diaphragm in position interfering with the proper working ofthe diaphragm.

lo the drawings aeeonipanying and forming a part of this specificationFigure 'l is a perspective view showing one side of my improveddiaphragm. namely the lower or post carrying side. Fig.3 is a similarview ol' the other or upper side of the diaphragm, Fig. 2' is al)l()\'(ll away enlarged central cross sectional view of the diaphragmand eenter )HSl. Fl". 4 is a central sectional view 0' a sound boxillustrating the diepliragii and gasket in position; and Fig. 5 isperspective view of a form of gasket: which may be employed with thediaphragm.

The body portion 7 of the diaphragm will bemade fromsome suitablefibrous sheetmaterial, as for instance paper of the rewill quill-edthickness and stability. The diaphragm, preferably after being cut tosize we coated with'some resilient material 8, which will beincorporated to a certain xtzont with the fiber of which the diaphragmtornado, art ieula-rly at the surface. This is tl-lu'strat bgtlie'stippling in Fig. 3.

The dirt ragm of my present an rovemeat is a apt-ed for'use in all seencon- 1'. in uments, and is articularly useit in to rig machines. henuged for a.

talking machine. a eenter post. will be pro vided for conneetirn thediaphragm witl the other parts of the mechanism In the present instancethe center post 9 is illustrated as made of sheet material, preferablythe same kind of sheet material as is the diaphragm. The post carriestwo prongs lU-l(l which pass through a suitable 0 JBII- ing in thecenter of the diaphragm ant are bent ever, see more partieularly i ig.3. Aftor the center )oet prongs have been passed through the (iaphragmand bent over in the proper position for holding the center post inplace the waterproof coating ma terial will be applied to the entirestructure and properly treated and cured. The waterproofing materialwill not only serve its purpose as such; but will also secure the prongsand the center post in rigid relation to the diaphragm. The fibroussheet, material and coating of resilient waterproof material togethergive a diaphragm which responds to or produees sound vibrations withoutadding any undersirahle tone quali ties thereto or detracting in any wayfrom the. sounds which are transmitted. The center )osl being of thesome material as is the iaphra m and treated in the same manner, andbeih securely held in position assists the diaphragm in the performanceof its work.

It will be noted in the drawings that the center post. 9 is of sheetmaterial applied to a diaphragm of sheet material with its edge l'estinagainst the face of the diaphragm.

In ig.4 there has been illustrated a form of sound box carrying myimproved diaphragm. The box is shown as made up of two members 11 and 12clamping the diaphragm in position between them by means of the gasket13, which gasket in practice will be of some yieldable material, as' forinstance lead wire. Byhavi'ng a yieldable gasket the diaphragm may. bost-cow clamped in position without "placing undue strain upon thediaphragm or permittin any -n1ovemcnt of the mphragm whici wouldinterfere with the sound.

Havin described my invention I claim:

1. A diaphra composed of sheet fibrous material a can or post of similarmaterial carried by one side of the diaphra m and having securing prongsentering t rou h the dmplua and bent over against t e other side t ereofaud a waterproof recite centrpost and securing these together, and

enl cuating upon said diaphragm, center a gnsketf of lead wire at the ege of the post, and securing prongs and scuring these together,substantially as specified. diaphragm.

2. A diaphragm composed of sheet fibrous CLARK ZARR. 5 material, acenter post of similarlmaterial Witnesses:

WM. SHE Y,

carried by the diuphra m, a waterproof HARRY W TEE.

coating surrounding the iaphragm and the

